Linear scale 'invert' method doesn't work

[yay]

fun main(args: Array<String>) {
    val scale = scaleLinear<Double>().domain(-100.0, 100.0).range(0.0, 100.0)
    println(scale(0.0))
    println(scale.invert(50.0)) // is this really supposed to throw?
}

[hudsonb]

Ideally no, it wouldn't throw an IllegalStateException in this common case and I'll fix it so that it doesn't.

It's more complicated than it sounds. A DeinterpolatorFactory wasn't provided to the scale so it really doesn't have any idea how to invert R. However, for this exact reason I made scaleLinear reified R so that I can inspect R and provide default implementations of ReinterpolatorFactory and DeinterpolatorFactory in common cases. It looks like I did that for ReinterpolatorFactory but not DeinterpolatorFactory.

D3 handles this by providing a default deinterpolator factory which works on numbers, and ONLY on numbers. D3 doesn't allow you to invert if your range is non-numeric. In Kubed you can invert on a range of any type, but you've got to tell it how by providing a deinterpolator and comparator.